India's second-largest IT major, on Thursday, approved its largest ever share buyback proposal worth ₹18,000 crore at a price of ₹1,800 per share, the company said in a regulatory filing late evening. The buyback price translates into a significant premium to the current price of the stock. The share buyback programme is at about a 19% premium over Thursday's market closing of ₹1,509.50 on BSE and ₹1,512.20 on NSE, which was lower by over 1% from the previous close.